Method for extracting lithium from strong-acidic electrolyte solution system

An electrolytic solution and strong acidic technology, which is applied in the field of extracting lithium in a strong acidic electrolytic solution system, can solve the problems of lithium extraction that have not been reported, environmental pollution, etc., and achieve the effects of easy separation, improved purity, and increased effective concentration

Inactive Publication Date: 2018-11-27
SHANXI UNIV
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Problems solved by technology

Patent CN104404268A invented a new type of co-extraction system and co-extraction method for extracting lithium from brine with high magnesium-lithium ratio. The invention consists of a composite extraction agent composed of imidazole ionic liquid with strong hydrophobicity and TBP, and hexafluorophosphate, etc. Co-extraction agent, the extraction rate of lithium is as high as 96.49%, which

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  • Method for extracting lithium from strong-acidic electrolyte solution system
  • Method for extracting lithium from strong-acidic electrolyte solution system

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Example Embodiment

[0021] Example 1

[0022] (1) Preparation of extraction organic phase: 75mL TBP and 75mL DCM were mixed to prepare extraction organic phase.

[0023] (2) Prepare the extraction water phase: the water phase is LiCl-AlCl 3 -CaCl 2 -H 2 O system, add LiCl, AlCl to the water phase 3 ·6H 2 O, CaCl 2 , HCl(12M), FeCl 3 ·6H 2 O, prepare 50mL extraction water phase, control the concentration of LiCl to 100ppm, the molar ratio of Li, Al, and Ca to 1:48:17, the acidity to 3M, and the molar ratio of iron to lithium to 4:1.

[0024] (3) Mix the organic phase obtained in step (1) with the water phase obtained in step (2) in a volume ratio of 3:1, stir at room temperature for 9 minutes and then stand for separation, determine the lithium content in the water phase, and calculate The extraction rate results are shown in Table 1.

Example Embodiment

[0025] Example 2

[0026] (1) Prepare the extraction organic phase: mix 100 mL TBP with 50 mL DCM to prepare the extraction organic phase.

[0027] (2) Prepare the extraction water phase: the water phase is LiCl-AlCl 3 -CaCl 2 -H 2 O system, add LiCl, AlCl to the water phase 3 ·6H 2 O, CaCl 2 , HCl(12M), FeCl 3 ·6H 2 O, prepare 50mL extraction water phase, control the concentration of LiCl to 100ppm, the molar ratio of Li, Al, and Ca to 1:48:17, the acidity to 3M, and the molar ratio of iron to lithium to 4:1.

[0028] (3) Mix the organic phase obtained in step (1) with the water phase obtained in step (2) in a volume ratio of 3:1, stir at room temperature for 9 minutes and then stand for separation, determine the lithium content in the water phase, and calculate The extraction rate results are shown in Table 1.

Example Embodiment

[0029] Example 3

[0030] (1) Prepare the extraction organic phase: mix 112.5 mL TBP and 37.5 mL DCM to prepare the extraction organic phase.

[0031] (2) Prepare the extraction water phase: the water phase is LiCl-AlCl 3 -CaCl 2 -H 2 O system, add LiCl, AlCl to the water phase 3 ·6H 2 O, CaCl 2 , HCl(12M), FeCl 3 ·6H 2 O, prepare 50mL extraction water phase, control the concentration of LiCl to 100ppm, the molar ratio of Li, Al, and Ca to 1:48:17, the acidity to 3M, and the molar ratio of iron to lithium to 4:1.

[0032] (3) Mix the organic phase obtained in step (1) with the water phase obtained in step (2) in a volume ratio of 3:1, stir at room temperature for 9 minutes and then stand for separation, determine the lithium content in the water phase, and calculate The extraction rate results are shown in Table 1.

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Abstract

The invention provides a method for extracting lithium from a strong-acidic electrolyte solution system. The method comprises the following steps: (1) preparing an organic phase, wherein the organic phase contains an extracting agent and a diluting agent, the extracting agent is tributyl phosphate (TBP), the diluting agent is dichloromethane (DCM), and the volume ratio of TBP to DCM is (1-8) to 1;(2) preparing a water phase, wherein the water phase is an LiCl-AlCl3-CaCl2-H2O system, the concentration of LiCl is controlled at 50ppm-500ppm, and the molar ratio of Li to Al to Ca is 1 to (20-60)to (5-20); (3) adding HCl into the water phase so as to regulate the acidity to 1M-5M; (4) continuing to add a co-extracting agent FeCl3.6H2O into the water phase, and controlling the molar ratio of iron to lithium at (1-6) to 1; and (5) mixing the organic phase obtained in the step (1) with the water phase obtained in the step (4) in a volume ratio of (0.5-5) to 1, stirring at the room temperature for 3-20 minutes, and standing for separation. By utilizing the method provided by the invention, the once extraction rate of lithium reaches over 60%, the problem that the lithium is difficult to extract under a strong acidic condition is solved, and the method is good in selectivity, simple in operation, easy for two-phase separation and low in cost and can be used for extracting lithium froma coal ash acid leaching solution.

Description

technical field [0001] The invention relates to the extraction of alkali metals, in particular to an extraction system which can be used for separating lithium in fly ash acid leaching solution, and specifically belongs to a method for extracting lithium in a strong acid electrolyte solution system. Background technique [0002] Lithium plays an increasing role in many technologies such as rechargeable batteries, thermonuclear fusion, medicine, grease, dyes, adhesives and electrode welding, making the demand for lithium increase year by year. Lithium resources exist in two forms of minerals and dissolved salts. However, mineral resources are limited, and people pay more attention to the utilization of liquid lithium resources. Fly ash contains a relatively high content of lithium (about 250-1400μg / g), reaching industrial grade. The high-value utilization of fly ash can be achieved by synergistically extracting lithium on the basis of extracting aluminum and silicon from fly...

Claims

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Application Information

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IPC IPC(8): C22B3/40C22B26/12
CPCC22B26/12C22B3/409Y02P10/20
Inventor 方莉程芳琴冯明赵晓丽郭彦霞
Owner SHANXI UNIV
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